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Japan (Nippon, Yaponiya, Nihon, Japon, Giappone)
latitude: 36.5
longitude: 138
Precision of location: Gauged from chart or map
Site Named Here: By name of sea, gulf, or country named in source publication
| Bergendalia diversa | 1918 or earlier | |||
| Prosthiostomum marmoratum | 1918 or earlier | |||
| Prosthiostomum awaense | 1918 or earlier | |||
| Prosthiostomum rubropunctatum | 1918 or earlier | |||
| Pseudoceros reticulatus | 1918 or earlier | |||
| Pseudoceros luteomarginatus | 1918 or earlier | |||
| Pseudoceros nigromarginatus | 1918 or earlier | |||
| Stylochus rutilis | 1918 or earlier | |||
| Stylochus ijimai | 1918 or earlier | |||
| Hoploplana ornata | 1918 or earlier | |||
| Discocelis japonica | 1918 or earlier | |||
| Paraplanocera misakiensis | 1918 or earlier | |||
| Planocera purpurea | 1918 or earlier | |||
| Pseudostylochus fulvus | 1918 or earlier | |||
| Polycelis ijimai | 1917 or earlier | |||
| Fonticola pellucida | 1916 or earlier | |||
| Phagocata pellucida | 1916 or earlier | |||
| Planaria pellucida | 1916 or earlier | |||
| Polycelis auriculata | 1916 or earlier | |||
| Polycelis karafto | 1916 or earlier | |||
| Procerodes limuli | 1916 or earlier | |||
| Procerodes trigonocephala | 1916 or earlier | |||
| Sorocelis sapporo | 1916 or earlier | |||
| Pericelis lactea | 2021 or earlier | southwestern Japan | ||
| Pericelis maculosa | 2021 or earlier | southwest Japan |